NSO Level 1- Science Olympiad (SOF) Class 8: Questions 515 - 518 of 1175
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Question 515
Question
MCQ▾Plastic is more durable than metals because
Choices
| Choice (4) | Response | |
|---|---|---|
a. | Plastic do not react with air and water. | |
b. | It does not undergo correlation easily. | |
c. | Plastic is non reactive with almost all chemicals. | |
d. | All a., b. and c. are correct | |
Question 516
Question
MCQ▾Identify the polymers from its use
It is used to make various things like mug, drums, syringe, gloves, bags etc
Choices
| Choice (4) | Response | |
|---|---|---|
a. | PVC | |
b. | Nylon | |
c. | Polythene | |
d. | Teflon | |
Question 517
Question
MCQ▾The property of Teflon which makes it suitable for using for non stick coating is
Choices
| Choice (4) | Response | |
|---|---|---|
a. | It cannot be recycled | |
b. | It cannot withstand high temperature | |
c. | Oil and water do not stick on it | |
d. | All of the above | |
Question 518
Question
MCQ▾Some of the most common blended fabrics are given in the questions. Find out the benefit of the blend over individual fabric.
Categorise the plastic materials in to thermo plastic and thermosetting plastic
Telephone instrument, 2. Plastic toys, 3. Cooker handles, 4. Carry bags, 5. Plastic chairs, 6. Electric switch boardsChoices
| Choice (4) | Response | |
|---|---|---|
a. | 1,2, 3 – thermosetting plastic and 4,5, 6 -thermo plastic | |
b. | 1,3, 6 – thermoplastic and 2,4, 5 -thermosetting plastic | |
c. | 1,3, 6 – thermosetting plastic and 2,4, 5 - thermoplastic | |
d. | 1,2, 3 — thermoplastic and 4,5, 6 -thermosetting plastic | |